In PosBuffer.C, there is a function which parses gdb answers and acquires information from it: gdb_filter. This function tries several cases, one of them is the UP and DOWN command outputs, with this if statement:

This will avoid many weird messages like: cannot find file /usr/src/0x12345 for example. Also it will avoid many unecessary info sources by ddd trying to find this weird file. If anyone wants a patch, let me know.